Polyacrylonitrile fibers vs Polyester: Comparison of Feel and Warmth

Feel Differences

Polyacrylonitrile fibers， also known as acrylic, have a rich crimp structure and a prominent fluffy appearance. They have a soft and fluffy touch, similar to that of wool, and are not prone to a cold and hard feeling. The surface friction characteristics of the fibers are moderate, and when made into fabrics, they are soft and full, suitable for making close-fitting or outer-layer warm fabrics. However, its anti-torsion performance is limited. After repeated friction, the surface is prone to forming fuzz, affecting the appearance and touch.

Polyester fibers have a smooth and crisp touch, with a smoother surface. The fabric has good forming properties and is not prone to softening. Regular polyester fabrics are dry and lack the fluffy and warm texture. Some high-density fabrics may have a cool feeling when touched. The advantage is strong shape stability, and after multiple washes, they are less likely to harden or become compact, and the fabric is less likely to deform. Modified polyester can have a softer touch, but the original fluffy degree is difficult to reach the level of acrylic.

Warmth Performance Comparison

The core of warmth lies in whether the fibers can retain static air. Polyacrylonitrile fibers  have a stable crimp structure and many gaps between fibers, which have a stronger ability to retain air. Their static warmth performance is better, and under the same fabric structure, the insulation effect is more prominent. They are classic raw materials for warm filling and knitted warm fabrics. However, their moisture absorption is weak. In high-humidity environments, the fabric is prone to getting damp, and the comfort level will decrease.

Polyester itself has stable thermal conductivity. The warmth of regular varieties is achieved through fabric structure, and the thermal insulation ability of the fibers themselves is relatively weak. Hollow and modified non-circular polyester relies on internal cavities to lock air, improving the warmth performance and better moisture resistance. After getting wet, the warmth performance decays less, and it is less likely to form lumps after washing. The stability of the fabric over the long term is better.

Neither of the two fibers has absolute superiority. Acrylic is suitable for scenarios that seek a soft and fluffy touch and static warmth; polyester is more focused on water resistance, easy care, and use in humid environments. When selecting and ordering, it is necessary to make a comprehensive judgment based on the usage environment and care requirements.

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